A cold front brought 70 mph winds and an 8,000 foot wall of dust to Lubbock, Texas shortly after 5:30pm Monday. Locals compared it to images of the Dust Bowl during the 1930s. Differing from the Arizona haboobs (usually caused by convection), the Lubbock haboob was caused by a cold front and was amplified by barren fields as a result of the ongoing drought.
Here is one video (of many) taken of the storm. Worth watching toward the end as visibility drops to just about zero, and the light turns an ominous orange.